In Reply to: Ah, narrow directivity tweeter posted by E-Stat on July 12, 2012 at 09:06:57:
Hi,> Ah, narrow directivity tweeter
Well I did say it was an 075.
Google Image Search for JBL 075
> That approach is exactly the opposite of what JBL does with many
> of their systems.Actually, the serious studio systems (and the derivative Home Versions which since the 1980's have generally not been sold in the US but strictly in Europe and Asia - e.g. Everest 4400, K2 and so on) have exceptionally well controlled directivity, though usually much wider than the original 1950's D130 & 075.
So you must be talking about the consumer grade stuff they generally sell in the US...
> They run midrange drivers up to frequencies where the image gets
> very narrow and then - transition to a wide dispersion tweeter!
>
> That results in a very strange pinched in the middle "fun house
> mirror" image. :)Yes, that is generally a very bad idea.
Given the JBL is part of Harman and Floyd O'Toole worked/works for Harman I am a little surprised such designs would actually be sold, but there is a large gap between actual engineering and marketing and customer expectations in Audio.
The Kind of "JBL" I am talking about is probably best embodied by the original Everest (D4400) though the more recent one is also pretty awesome and the S9500 and related Speakers.
Ciao T
Thor
At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?
Edits: 07/12/12
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Follow Ups
- RE: Ah, narrow directivity tweeter - Thorsten 09:17:45 07/12/12 (2)
- RE: Ah, narrow directivity tweeter - E-Stat 09:27:05 07/12/12 (1)
- RE: Ah, narrow directivity tweeter - Thorsten 10:04:55 07/12/12 (0)